You can change the callouts color in dark mode. Follow the below workaround to change the callouts color in dark mode.

Solution

  1. Go to Settings -> Knowledge base site -> Custom CSS & JavaScript, and Custom CSS

  2. Paste the below CSS snippet in the window

body.dark_theme .infoBox {
    color: #ffffff;
    background-color: #5f9ea0;
}

body.dark_theme .warningBox {
    color: #ffffff;
    background-color: #ff8c00;
}

body.dark_theme .errorBox {
    color: #ffffff;
    background-color: #a52a2a;
}
  1. Update the desired color for the callouts

color → Text color
background-color → Callout box color

  1. Click Save